MetricConverter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SimpleConditions
{
    class Program
    {
        static void Main()
        {
            double initialValue = double.Parse(Console.ReadLine());
            string fromUnit = Console.ReadLine();
            string toUnit = Console.ReadLine();

            string mAsString = "m";
            string mmAsString = "mm";
            string cmAsString = "cm";
            string miAsString = "mi";
            string inAsString = "in";
            string kmAsString = "km";
            string ftAsString = "ft";
            string ydAsString = "yd";

            double mmValue = 1000;
            double cmValue = 100;
            double miValue = 0.000621371192;
            double inValue = 39.3700787;
            double kmValue = 0.001;
            double ftValue = 3.2808399;
            double ydValue = 1.0936133;

            double numberInMeters = initialValue;
            if (fromUnit == mmAsString)
            {
                numberInMeters = initialValue / mmValue;
            }
            else if (fromUnit == cmAsString)
            {
                numberInMeters = initialValue /  cmValue;
            }
            else if (fromUnit == miAsString)
            {
                numberInMeters = initialValue / miValue;
            }
            else if (fromUnit == inAsString)
            {
                numberInMeters = initialValue / inValue;
            }
            else if (fromUnit == kmAsString)
            {
                numberInMeters = initialValue / kmValue;
            }
            else if (fromUnit == ftAsString)
            {
                numberInMeters = initialValue / ftValue;
            }
            else if (fromUnit == ydAsString)
            {
                numberInMeters = initialValue / ydValue;
            }

            if (toUnit == mmAsString)
            {
                numberInMeters *= mmValue;
            }
            else if (toUnit == cmAsString)
            {
                numberInMeters *= cmValue;
            }
            else if (toUnit == miAsString)
            {
                numberInMeters *= miValue;
            }
            else if (toUnit == inAsString)
            {
                numberInMeters *= inValue;
            }
            else if (toUnit == kmAsString)
            {
                numberInMeters *= kmValue;
            }
            else if (toUnit == ftAsString)
            {
                numberInMeters *= ftValue;
            }
            else if (toUnit == ydAsString)
            {
                numberInMeters *= ydValue;
            }


            Console.WriteLine($"{numberInMeters:f8}");
        }
    }
}